High-voltage switch cabinet with safety interlocking structure

Abstract

The present application relates to the technical field of switch cabinet, especially to a high-voltage switch cabinet with a safety interlocking structure, comprising a cabinet body, a cabinet door, a mutual inductor stub installed in the cable chamber of the cabinet body, a grounding switch, and an operating lever matched with the grounding switch, wherein a cable is installed on the mutual inductor stub, and the opening and closing of the grounding switch are controlled by rotating the operating lever. The electric push rod extends to lift the lifting frame after the cabinet body is powered off, and the electric tester is attached to the mutual inductor stub to avoid the risk of live working. The electric tester alarm is divided into two categories: one is the power-off operation failure, the cabinet body is not completely powered off, and the power-off process of the upper level needs to be reviewed; the other is that the cabinet body has been powered off, and the line has residual charge, which is discharged by the temporary grounding device of the high-voltage switch. After the alarm, the cabinet power-off state is checked first, and then the residual charge is released. If the electric tester does not alarm, it means that the cabinet is powered off and there is no residual charge in the line, and the closing operation of the grounding switch can be directly performed.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and in particular to a high-voltage switchgear with a safety interlocking structure. Background Technology

[0002] Currently, high-voltage switchgear used in 750 kV and above ultra-high voltage AC transmission projects and smart backbone power grids has formed a relatively mature complete technical system. It can meet the basic needs of large-scale power grid steady-state operation and basic fault protection. The mainstream high-voltage switchgear in the industry is equipped with mechanical interlocking protection structures that comply with power specifications. Relying on basic structures such as mechanical transmission, snap-lock limit, and program lock, it realizes core protection functions such as circuit breaker opening and closing control, interlocking of disconnecting switches and grounding switches, and live door locking. It can effectively avoid the risks of conventional human error. This type of mechanical structure is technically mature, stable in operation, and cost-controllable. It is widely applicable to the conventional operation and maintenance scenarios of ultra-high voltage hub substations and main transmission substations, and is the basic guarantee for the safety protection of current power grid equipment.

[0003] Chinese utility model patent CN219535274U discloses a safety interlock protection mechanism for switchgear, belonging to the field of switchgear. It includes a switchgear body, a working slot, a damping shaft, a rotating cylinder, a power-off grounding button, and a top plate. A foot pedal is fixedly connected to the side of the rotating cylinder away from the switchgear body. A plug cylinder is fixedly connected to one side of the inner wall of the switchgear body. An electromagnet is fixedly connected to the inner wall of the plug cylinder near the switchgear body. An opening is provided on the side of the cabinet door near the plug cylinder. A sliding plate is slidably connected inside the opening. A connecting block is fixedly connected to the side of the sliding plate near the plug cylinder. A plug block adapted to the plug cylinder is fixedly connected to the side of the connecting block near the plug cylinder. Through the cooperation of the switchgear body, cabinet door, working slot, damping shaft, rotating cylinder, power-off grounding button, top plate, foot pedal, plug cylinder, electromagnet, opening, sliding plate, connecting block, and plug block, the safety hazards for workers inspecting and maintaining the switchgear are effectively reduced. The aforementioned existing technology triggers the power-off grounding button via a pedal and unlocks the cabinet door. However, it lacks a warning process for residual charge in the circuit after the cabinet is powered off. There may be residual charge in the circuit after the cabinet is powered off, and opening the cabinet door at this time poses a risk of electric shock. Summary of the Invention

[0004] The object of the present invention is to address the drawbacks existing in the prior art, and proposes a high-voltage switch cabinet with a safety interlock structure. Through the arranged power detection assembly of the present invention, after the cabinet body is powered off, the electric push rod extends out to jack up the lifting frame, which drives the electroscope to fit on the mutual inductor terminal for power detection, thereby avoiding the risk of live working. There are two types of electroscope alarms: first, there is a power-off operation error, the cabinet body is not completely powered off, and the superior power-off procedure needs to be rechecked; second, the cabinet body has been powered off, but there is residual charge on the line, and the temporary grounding device of the high-voltage switch is used for discharging. After an alarm occurs, the power-off state of the cabinet body is preferentially checked, and then the residual charge is released. If the electroscope does not alarm, it indicates that the cabinet body is properly powered off and there is no residual electricity on the line, and the closing operation of the grounding switch can be directly performed.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a high-voltage switch cabinet with a safety interlock structure, comprising a cabinet body, a cabinet door, a mutual inductor terminal and a grounding switch installed in the cable chamber of the cabinet body, an operating rod arranged in matching with the grounding switch, wherein a cable is installed on the mutual inductor terminal, and the opening and closing of the grounding switch are controlled by rotating the operating rod, and further comprising: a power detection assembly located below the mutual inductor terminal, wherein the power detection assembly comprises an electroscope; a lifting frame, wherein the lifting frame is slidably connected to the inner wall of the cabinet body; a lock rod assembly floatingly arranged in the cabinet body, wherein the power detection assembly is installed on the lifting frame; after the cabinet body is powered off, the lifting frame drives the contact of the electroscope to abut against the mutual inductor terminal to detect the line charge and unlock the operating rod at the same time, and when the power detection process is not performed, the operating rod is in a locked state; a door locking assembly located between the operating rod and the cabinet door, wherein after the power detection process is completed, the grounding switch is controlled to close and ground by rotating the operating rod, the operating rod triggers the door locking assembly to unlock the cabinet door, and when the grounding switch is not closed, the cabinet door is in a locked state; a detection assembly configured to determine whether the operating rod returns to the original position after the cabinet door is closed.

[0006] Preferably: the lock rod assembly comprises a swing rod fixed on the outer wall of the operating rod, a limit post is arranged on the outer wall of the swing rod away from the operating rod, a first lock frame extending toward the swing rod is arranged on the outer wall of the lifting frame, a vertically distributed limit slot is opened on the outer wall of the first lock frame, and when the swing rod is at the opening station of the grounding switch, the limit post is located in the limit slot.

[0007] Preferably: an electric push rod is fixedly installed on the inner wall of the cabinet body, and the output end of the electric push rod is fixed on the outer wall of the lifting frame.

[0008] Preferably, the outer wall of the lifting frame is provided with an insulating baffle, the outer wall of the cabinet door is provided with a window, and when the cabinet door is closed, the insulating baffle blocks the window. Both the outer walls of the lifting frame and the insulating baffle are provided with clearance grooves, and both the outer walls of the cabinet and the insulating baffle are provided with pin holes.

[0009] Preferably, the detection component includes a laser emitter and a receiver. The laser emitter is fixed in the limiting groove, and the receiver is fixed on the bottom inner wall of the cabinet. The outer wall of the limiting column is provided with a through hole that allows the laser to pass through. When the swing rod is in the grounding switch open position, the through hole is in a vertical state.

[0010] Preferably, the detection component includes a laser emitter and a receiver. There are two laser emitters, which are fixedly installed on the inner side wall of the cabinet, and the receiver is embedded in the limiting post.

[0011] Preferably, the door locking assembly includes a second locking frame disposed on the inner wall of the cabinet door, and an arc-shaped groove adapted to the limiting post is provided on the outer wall of the second locking frame. When the cabinet door is closed, the arc-shaped groove and the operating rod are concentrically distributed.

[0012] Preferably, the voltage detector is fixed on the top outer wall of the lifting frame, and there are three voltage detectors, which correspond one-to-one with the three phases of the current transformer terminals.

[0013] Compared with existing technologies, the advantages of this invention are: By incorporating a voltage detection component, after the cabinet is de-energized, the electric push rod extends to lift the lifting frame, causing the voltage detector to contact the current transformer terminals for voltage detection, thus avoiding the risks of live-line work. Voltage detector alarms fall into two categories: first, an error in the de-energization operation where the cabinet is not completely de-energized, requiring verification of the superior de-energization procedure; second, the cabinet is de-energized but residual charge remains in the lines, which is discharged using the temporary grounding device integrated into the high-voltage switch. After an alarm, the cabinet's de-energization status is checked first, then the residual charge is released. If the voltage detector does not alarm, it indicates that the cabinet is fully de-energized and the lines have no residual power, allowing direct execution of the grounding switch closing operation. The present invention uses a locking rod assembly to cause the first locking frame to move upward synchronously when the lifting frame moves upward. This causes the first locking frame to move the limiting groove away from the limiting post on the swing rod, thereby unlocking the operating rod. This ensures that the operating rod can only be unlocked after the voltage testing step is completed, thus avoiding the possibility of closing the circuit while the circuit is energized due to a logic jump operation. This invention, through its locking assembly, allows the operator to trigger the grounding switch to close when the grounding switch is closed. Since the operating rod extends to the outside of the cabinet, the operator can attach the operating handle to the operating rod and rotate it to trigger the grounding switch to close. The operating rod then drives the swing arm to rotate synchronously, causing the swing arm to slide the limit pin out of the arc-shaped groove on the second locking frame, thereby unlocking the cabinet door. This ensures that the door can only be opened after the grounding switch is closed, avoiding logic-jumping operations that could lead to opening the door while it is energized. Attached Figure Description

[0014] Figure 1 is a three-dimensional schematic diagram of the overall structure proposed by the present invention; Figure 2 is a three-dimensional cross-sectional schematic diagram of the overall structure proposed by the present invention; Figure 3 is a layout schematic diagram of the working state of the voltage detection assembly proposed by the present invention; Figure 4 is a partial schematic diagram of the grounding switch in the closed state proposed by the present invention; Figure 5 is a three-dimensional schematic diagram of the overall structure in the door open state proposed by the present invention; Figure 6 is a three-dimensional schematic diagram of the lifting frame proposed by the present invention; Figure 7 is a partial schematic diagram of the detection assembly proposed by the present invention; Figure 8 is a partial schematic diagram of the grounding switch in the open state proposed by the present invention.

[0015] In the accompanying drawings, the components represented by each reference numeral are as follows: 1. Cabinet body; 11. Transformer terminal; 12. Pin hole; 2. Grounding switch; 21. Operating rod; 22. Swing rod; 221. Limit post; 222. Through hole; 3. Lifting frame; 31. Insulating baffle; 311. Avoidance groove; 32. Voltage detector; 33. First locking frame; 331. Limit groove; 34. Electric push rod; 4. Laser transmitter; 41. Receiver; 5. Cabinet door; 51. Second locking frame; 52. Arc-shaped groove; 53. Window. DETAILED DESCRIPTION

[0016] Hereinafter, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] First Embodiment: refer to Figures 1 to 6 as shown in the figures, a high-voltage switch cabinet with a safety interlock structure includes a cabinet body 1, a cabinet door 5, a transformer terminal 11 and a grounding switch 2 installed in a cable chamber of the cabinet body 1, and an operating rod 21 arranged in matching with the grounding switch 2. A cable is installed on the transformer terminal 11, and the opening and closing of the grounding switch 2 are controlled by rotating the operating rod 21, further comprising: The voltage detection assembly is located below the current transformer terminal 11. The voltage detection assembly includes a voltage detector 32, which is fixed on the top outer wall of the lifting frame 3. There are three voltage detectors 32, and they correspond one-to-one with the three phases of the current transformer terminal 11. A lifting frame is slidably connected to the inner wall of the cabinet; The locking rod assembly is floatingly installed inside the cabinet 1. The voltage detection assembly is installed on the lifting frame 3. When the cabinet 1 is de-energized, the lifting frame 3 first drives the contact of the voltage detector 32 to abut against the current transformer terminal 11 to detect the line charge and unlock the operating rod 21 at the same time. When the voltage detection process is not performed, the operating rod 21 is in a locked state. The locking rod assembly includes a swing rod 22 fixed on the outer wall of the operating rod 21. A limit post 221 is provided on the outer wall of the swing rod 22 away from the operating rod 21. A first locking frame 33 extending towards the swing rod 22 is provided on the outer wall of the lifting frame 3. Vertically distributed limit grooves 331 are opened on the outer wall of the first locking frame 33. When the swing rod 22 is in the open position of the grounding switch 2, the limit post 221 is located in the limit groove 331. An electric push rod 34 is fixedly installed on the inner wall of the cabinet 1. The output end of the electric push rod 34 is fixed on the outer wall of the lifting frame 3. The door locking assembly is located between the operating lever 21 and the cabinet door 5. After the voltage testing process is completed, the grounding switch 2 is closed and grounded by rotating the operating lever 21. The operating lever 21 triggers the door locking assembly to unlock the cabinet door 5. When the grounding switch 2 is not closed, the cabinet door 5 is in a locked state. The door locking assembly includes a second lock frame 51 set on the inner wall of the cabinet door 5. The outer wall of the second lock frame 51 is provided with an arc-shaped groove 52 that is adapted to the limit post 221. When the cabinet door 5 is closed, the arc-shaped groove 52 and the operating lever 21 are concentrically distributed. The detection component is used to determine whether the operating lever 21 has returned to its original position after the cabinet door 5 is closed. The detection component includes a laser emitter 4 and a receiver 41. The laser emitter 4 is fixed in the limiting groove 331, and the receiver 41 is fixed on the bottom inner wall of the cabinet 1. A through hole 222 is provided on the outer wall of the limiting post 221 to allow the laser to pass through. When the swing lever 22 is in the open position of the grounding switch 2, the through hole 222 is in a vertical state.

[0018] It should be noted that before opening cabinet door 5, the power to cabinet 1 should first be cut off by controlling the circuit breaker or air switch built into cabinet 1. In order to avoid opening the door while it is energized, it is also necessary to control the grounding switch 2 to close to prevent reverse power supply. Since there may still be residual charge in the line after cabinet 1 is de-energized, especially in high voltage circuit systems of 750kV and above, the residual voltage of the line is stronger after the power is cut off, and the risk of discharge is greater. If the switch is closed while energized, there is a risk of electric shock.

[0019] After the cabinet 1 is de-energized, the electric push rod 34 extends, pushing the lifting frame 3 upward. The lifting frame 3 then moves the voltage detector 32 upward and abuts against the current transformer terminal 11 to detect whether there is electricity in the line, thus avoiding live operation and potential safety hazards. At the same time, the lifting frame 3 moves the first locking frame 33 upward, causing the first locking frame 33 to move the limit groove 331 away from the limit post 221 on the swing rod 22, thereby unlocking the operating rod 21. This ensures that the operating rod 21 can only be unlocked after the voltage detection step is completed, preventing the circuit breaker from closing while energized due to a tripped logic operation.

[0020] If voltage detector 32 alarms, it indicates that the line is still energized. There are two possible reasons for this: First, the power-off process was not performed correctly, and cabinet 1 was not successfully de-energized. In this case, it is necessary to return to the previous level to verify the power-off operation of cabinet 1. Second, cabinet 1 was successfully de-energized, but residual charge remains in the line. In this case, the residual charge can be discharged through the temporary grounding mechanism installed in the high-voltage switch. Therefore, when voltage detector 32 alarms, it is necessary to first verify whether cabinet 1 was successfully de-energized before discharging any residual charge in the line.

[0021] Similarly, if the voltage detector 32 does not trigger an alarm, it indicates that cabinet 1 has been successfully de-energized and there is no residual charge in the line. At this time, the grounding switch 2 can be closed.

[0022] When the grounding switch 2 is closed, since the operating rod 21 extends to the outside of the cabinet 1, the operator can use the operating handle to put on the operating rod 21, thereby rotating the operating rod 21 to trigger the grounding switch 2 to close. The operating rod 21 drives the swing rod 22 to rotate synchronously, so that the swing rod 22 drives the limit post 221 to slide out of the arc groove 52 on the second lock frame 51, thereby unlocking the cabinet door 5. This ensures that the door can only be opened after the grounding switch 2 is closed, avoiding the situation of opening the door while it is energized due to the tripping logic operation.

[0023] When it is necessary to close the cabinet door 5, first close the cabinet door 5, then control the grounding switch 2 to open the gate through the operating lever 21. At the same time, the operating lever 21 drives the limit post 221 to slide back into the arc groove 52 on the second lock frame 51, thus locking the cabinet door 5. Then control the electric push rod 34 to retract, and the electric push rod 34 drives the lifting frame 3 to move down and reset, so that the lifting frame 3 drives the limit groove 331 on the first lock frame 33 to be fitted onto the limit post 221, thereby restricting the rotational freedom of the swing rod 22, and thus completing the locking of the operating lever 21.

[0024] Furthermore, during the aforementioned process, as the swing arm 22 drives the limit post 221 to reset to the open position of the grounding switch 2, the limit post 221 will first block the laser. When the swing arm 22 drives the limit post 221 to fully reset to the open position of the grounding switch 2, the through hole 222 on the limit post 221 is in a vertical state. At this time, the laser from the laser emitter 4 passes through the through hole 222 and shines towards the receiver 41. During the entire reset process, the receiver 41 will briefly lose the laser signal and then receive the laser again. The outside world can judge whether the grounding switch 2 is fully open and whether the limit post 221 is reset to directly below the limit groove 331 by the change in the receiver 41 signal. If the swing arm 22 does not reset smoothly, the receiver 41 will either always receive the laser or never receive the laser.

[0025] Second embodiment: like Figure 7 As shown, the detection component includes a laser emitter 4 and a receiver 41. There are two laser emitters 4, which are fixedly installed on the inner side wall of the cabinet 1. The receiver 41 is embedded in the limiting post 221.

[0026] It should be noted that this embodiment has the same structure as the first embodiment, except that the laser emitter 4 and receiver 41 are installed in different positions.

[0027] By using the receiver 41 embedded in the limit post 221, when the swing arm 22 is in the open or closed position of the grounding switch 2, the receiver 41 can be aligned with the two laser emitters 4 fixed on the inner wall of the cabinet 1 respectively. The outside world can judge whether the grounding switch 2 is in the open or closed position through the signal of the receiver 41, thus avoiding safety hazards caused by erroneous operation.

[0028] Third embodiment: It should be noted that this implementation further supplements the working logic of the laser emitter 4 and receiver 41 in the detection component.

[0029] In the first embodiment, when the swing rod 22 moves from the open position to the close position of the grounding switch 2, the swing rod 22 drives the limit post 221 to move synchronously, causing the limit post 221 to drive the through hole 222 to deviate from the laser, so that the laser is temporarily blocked by the limit post 221. When the swing rod 22 rotates to the close position, the receiver 41 receives the excitation signal again. At this time, the control system of the switch cabinet controls the electric push rod 34 to perform a small stroke reciprocating extension and retraction movement, so that the electric push rod 34 drives the lifting frame 3 to perform a vertical reciprocating movement. The lifting frame 3 drives the voltage detector 32 away from the current transformer terminal 11 and then abuts against the current transformer terminal 11 again, thereby achieving the effect of secondary voltage detection after the grounding switch 2 is closed.

[0030] Similarly, in the second embodiment, when the swing arm 22 moves from the open position to the close position of the grounding switch 2, the swing arm 22 drives the limit post 221 to move synchronously, so that the receiver 41 on the limit post 221 moves away from one of the laser emitters 4 and then aligns with the other laser emitter 4. The receiver 41 receives the excitation signal again. At this time, the control system of the switch cabinet controls the electric push rod 34 to perform a small-stroke reciprocating extension and retraction movement, so that the electric push rod 34 drives the lifting frame 3 to move up and down once. The lifting frame 3 drives the voltage detector 32 away from the current transformer terminal 11 and then abuts against the current transformer terminal 11 again, thereby achieving the effect of secondary voltage detection after the grounding switch 2 is closed.

[0031] Fourth embodiment: An insulating baffle 31 is provided on the outer wall of the lifting frame 3, and a window 53 is provided on the outer wall of the cabinet door 5. When the cabinet door 5 is closed, the insulating baffle 31 blocks the window 53. A clearance groove 311 is provided on the outer wall of both the lifting frame 3 and the insulating baffle 31, and a pin hole 12 is provided on the outer wall of both the cabinet body 1 and the insulating baffle 31.

[0032] It should be noted that this embodiment is the implementation method when the electric push rod 34 is de-energized, and the electric push rod 34 is a ball screw type non-self-locking electric push rod, which can be manually triggered to extend or retract after power failure.

[0033] When the electric push rod 34 is de-energized, the lifting frame 3 loses its support. Under the gravity of the lifting frame 3, the lifting frame 3 drives the first locking frame 33 to move down to the limiting groove 331 and abut against the limiting post 221, so that the limiting groove 331 and the limiting post 221 will not separate, thus maintaining the locking effect.

[0034] When cabinet door 5 needs to be opened, after cabinet 1 is powered off, the operator wearing insulated gloves pushes the insulating baffle 31 upward and opens the window 53 on cabinet door 5. When the pin hole 12 on the insulating baffle 31 is aligned with the pin hole 12 on cabinet 1, the pin is inserted to lock the insulating baffle 31. External personnel can perform manual voltage testing through window 53. The outer walls of the lifting frame 3 and the insulating baffle 31 are provided with clearance grooves 311 to leave sufficient operating space.

[0035] It should be noted that in actual operation, the live electrical control detection cannot be used as the basis for confirming that the door is open for maintenance when there is no power. Operators need to wear insulated gloves and use a handheld voltage detector to perform three-phase voltage testing. When the first voltage test alarm is triggered, the operator needs to perform a second voltage test after handling the abnormality. Therefore, the voltage testing component set in this invention is used as an early warning. After the voltage testing component completes the automatic voltage testing process, manual voltage testing is still required. Automatic voltage testing is performed after the cabinet 1 is de-energized, replacing the first manual voltage testing process.

[0036] Meanwhile, during the above process, the insulating baffle 31 drives the lifting frame 3 to move upward, and the lifting frame 3 drives the first locking frame 33 to move upward synchronously, so that the first locking frame 33 drives the limiting groove 331 away from the limiting post 221 on the swing rod 22, thereby unlocking the operating rod 21, so that the device can still ensure the normal locking function when the electric push rod 34 is de-energized.

[0037] Working principle: Before opening cabinet door 5, the power must be cut off using the circuit breaker or air switch built into cabinet 1, and the grounding switch 2 must be closed to prevent backfeeding and opening the door while energized. After cabinet 1 is de-energized, the electric push rod 34 extends and pushes the lifting frame 3 upward, simultaneously completing two actions: first, the voltage detector 32 moves upward with the lifting frame 3 to contact the current transformer terminal 11 to detect residual voltage in the line and avoid the risk of live operation; second, the first locking frame 33 moves upward simultaneously, causing its limiting groove 331 to disengage from the limiting post 221 of the swing rod 22, unlocking the operating rod 21. This interlocking structure can enforce the voltage detection process and prevent illegal operations such as skipping steps and closing the switch while energized.

[0038] If voltage detector 32 alarms, it means that the line is still energized. There are two main situations: First, the power-off operation of cabinet 1 was incorrect and the equipment was not completely de-energized. The power-off procedure needs to be re-verified. Second, the power-off of cabinet 1 was normal, but residual charge remains in the line. This can be discharged through the temporary grounding mechanism of the equipment. Troubleshooting should follow the principle of verifying the power-off first and then releasing the residual voltage.

[0039] If the voltage detector 32 does not alarm, it means that the cabinet 1 is completely de-energized and there is no residual voltage in the line. The grounding switch 2 can be closed. The operator manually closes the switch through the operating rod 21 on the outside of the cabinet 1. The operating rod 21 drives the swing rod 22 to rotate, so that the limit post 221 disengages from the arc groove 52 of the second lock frame 51, unlocking the cabinet door 5, forming a safety interlock of closing the switch before opening the door, eliminating the hidden danger of opening the door while it is energized.

[0040] After the equipment operation is completed, close the cabinet door 5, control the grounding switch 2 to open via the operating lever 21, and the limit post 221 re-engages into the arc groove 52 of the second locking frame 51 to lock the cabinet door 5. Then, the electric push rod 34 retracts, driving the lifting frame 3 to move down and reset. The limit groove 331 of the first locking frame 33 fits onto the limit post 221, restricting the rotation of the swing rod 22 and locking the operating lever 21, thus completing the entire reset and locking process.

[0041] After the grounding switch 2 is tripped and reset, the through hole 222 of the limit post 221 is in a vertical state. The beam of the laser emitter 4 can penetrate the through hole 222 and be received by the receiver 41. The staff can accurately judge the tripping status of the grounding switch 2 and whether the reset position of the limit post 221 meets the standard by receiving the signal, so as to realize the accurate verification of the equipment interlocking status.

[0042] The second embodiment differs from the first embodiment in that the laser emitter 4 and receiver 41 are installed in different positions. By embedding the receiver 41 in the limit post 221, when the swing arm 22 is in the open or closed position of the grounding switch 2, the receiver 41 can be aligned with the two laser emitters 4 fixed on the inner wall of the cabinet 1 respectively. The outside world can judge whether the grounding switch 2 is open or closed through the signal of the receiver 41, thus avoiding safety hazards caused by erroneous operation.

[0043] The second embodiment further supplements the detection logic of the laser transmitter 4 and receiver 41. In the first embodiment, when the swing arm 22 moves from the open position of the grounding switch 2 to the closed position, it drives the limit post 221 to move, causing its through hole 222 to deviate from the optical path and block the laser. After the swing arm 22 is in position and the switch is closed, the receiver 41 receives the laser signal again. At this time, the control system of the cabinet 1 drives the electric push rod 34 to reciprocate slightly, driving the lifting frame 3 and the voltage detector 32 to move up and down slightly, so that the voltage detector 32 disengages and re-attaches to the current transformer terminal 11, realizing the secondary voltage verification after the switch is closed.

[0044] In the second embodiment, during the process of the swing arm 22 rotating to the closing position, the limit post 221 drives the receiver 41 to detach from the original laser transmitter 4 and align with another set of laser transmitters 4 to receive signals again. The system also controls the electric push rod 34 to perform small reciprocating movements, driving the voltage detector 32 to repeatedly contact the current transformer terminal 11 for detection, completing the secondary voltage detection after the grounding switch 2 is closed, further ensuring the safe operation of high-voltage equipment.

[0045] This embodiment introduces an interlocking emergency solution for the ball screw type non-self-locking electric push rod 34 after power failure. After power failure, this push rod can be manually driven to extend and retract. After power failure, the electric push rod 34 no longer provides support for the lifting frame 3. The lifting frame 3 drives the first locking frame 33 to move down to the limiting groove 331 and abut against the limiting post 221, so that the limiting groove 331 continuously engages with the limiting post 221, maintaining the locking state of the operating rod 21 and avoiding interlocking failure.

[0046] Emergency operation for opening cabinet door 5: After the power to cabinet 1 is cut off, open window 53 of cabinet door 5. After wearing insulated gloves, the operator lifts the insulating baffle 31 upwards. After the pin hole 12 of the insulating baffle 31 is aligned with the pin hole 12 of cabinet 1, insert the pin to fix the insulating baffle 31. The operator conducts manual voltage testing through window 53. The lifting frame 3 and the outer wall of the insulating baffle 31 have clearance grooves 311 to allow for manual operation. Lifting the insulating baffle 31 upwards can lift the lifting frame 3 and the first locking frame 33, so that the limiting groove 331 is disengaged from the limiting post 221, unlocking the operating rod 21, and realizing the normal unlocking of the interlocking mechanism under the power failure state of the push rod.

[0047] Manual voltage testing process: The operator uses a voltage testing tool to check whether the cable joints are energized phase by phase. The cable joints are installed on the transformer terminal 11. During the inspection, only the transformer terminal 11 needs to be checked. Figure 3 As can be seen, after opening window 53, the position of transformer terminal 11 can be directly observed. Only after all three phases of the line have been tested for voltage can the next step be carried out.

[0048] It should be noted that the voltage detection component of this invention is only for early warning and cannot be used as the basis for determining the lack of power during door opening and maintenance. The automatic voltage detection of the equipment can save the first round of manual voltage detection. Subsequently, the staff still need to wear insulated tools to complete the three-phase verification voltage detection. The first voltage detection alarm needs to be handled and retested. The double voltage detection ensures the safety of high voltage maintenance.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage switch cabinet with a safety interlock structure, comprising a cabinet body, a cabinet door, a transformer terminal and an earthing switch installed in a cable chamber of the cabinet body, and an operating rod arranged in matching with the earthing switch, wherein a cable is installed on the transformer terminal, and opening and closing of the earthing switch is controlled by rotating the operating rod, characterized in that, Also includes: A voltage detection assembly is located below the terminals of the current transformer, and the voltage detection assembly includes a voltage detector; A lifting frame is slidably connected to the inner wall of the cabinet; The locking rod assembly is floatingly installed inside the cabinet. The voltage detection assembly is installed on the lifting frame. When the cabinet is de-energized, the lifting frame first drives the contact of the voltage detector to abut against the terminal of the current transformer to detect the line charge and unlock the operating rod at the same time. When no voltage detection process is being performed, the operating rod is in the locked state. The door locking assembly is located between the operating lever and the cabinet door. After the voltage testing process is completed, the grounding switch is closed by rotating the operating lever. The operating lever triggers the door locking assembly to unlock the cabinet door. When the grounding switch is not closed, the cabinet door is in a locked state. The detection component is used to determine whether the operating lever has returned to its original position after the cabinet door is closed.

2. A high-voltage switchgear with a safety interlocking structure according to claim 1, characterized in that: The locking rod assembly includes a swing rod fixed to the outer wall of the operating rod. A limit post is provided on the outer wall of the swing rod away from the operating rod. A first locking frame extending towards the swing rod is provided on the outer wall of the lifting frame. Vertically distributed limit grooves are provided on the outer wall of the first locking frame. When the swing rod is in the grounding switch opening position, the limit post is located in the limit groove.

3. A high-voltage switchgear with a safety interlocking structure according to claim 2, characterized in that: An electric push rod is fixedly installed on the inner wall of the cabinet, and the output end of the electric push rod is fixed on the outer wall of the lifting frame.

4. A high-voltage switchgear with a safety interlocking structure according to claim 2, characterized in that: An insulating baffle is provided on the outer wall of the lifting frame, and a window is provided on the outer wall of the cabinet door. When the cabinet door is closed, the insulating baffle blocks the window. A clearance groove is provided on the outer wall of both the lifting frame and the insulating baffle, and a pin hole is provided on the outer wall of both the cabinet and the insulating baffle.

5. A high-voltage switchgear with a safety interlocking structure according to claim 2, characterized in that: The detection component includes a laser emitter and a receiver. The laser emitter is fixed in the limiting groove, and the receiver is fixed on the bottom inner wall of the cabinet. The outer wall of the limiting column is provided with a through hole that allows the laser to pass through. When the swing rod is in the grounding switch open position, the through hole is in a vertical state.

6. A high-voltage switchgear with a safety interlocking structure according to claim 2, characterized in that: The detection component includes a laser emitter and a receiver. There are two laser emitters, which are fixedly installed on the inner side wall of the cabinet, and the receiver is embedded in the limiting post.

7. A high-voltage switchgear with a safety interlocking structure according to claim 1, characterized in that: The door locking assembly includes a second lock frame disposed on the inner wall of the cabinet door. The outer wall of the second lock frame is provided with an arc-shaped groove adapted to the limiting post. When the cabinet door is closed, the arc-shaped groove and the operating rod are concentrically distributed.

8. A high-voltage switchgear with a safety interlocking structure according to claim 1, characterized in that: The voltage detector is fixed on the top outer wall of the lifting frame. There are three voltage detectors, and they correspond one-to-one with the three phases of the current transformer terminals.

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